Machine tool



July 13, 1937. E. P. BULLARD ET AL MACHINE TOOL Filed Oct. 50, 1936 9Sheets-Sheet 1 July 13,- 1937.

E. P. BULLARD. ET A1. 2,086,852

MACHINETOOL Filed Oct. 30, 1956 9 Sheets-Sheet 2 July 13, 1937. E, p,BULLARD ET AL 2,086,852

MACHINE TOOL'.

Filed oct. so, 195e 9 sheets-smet 4 g TS/WRNEX July 13, T937. rfa@ULL/mn E1 AL 2,086,852

MACHINE TOOL -Filed ont. so. 193e 9 sheets-sheet s .uly 1'3, 1937.

E. P. BULLARD ET AL MACHINE TOOL Filed Oct. 50, 19:56

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9 Sheets-Sheet 6 37' www.

`Iuly 13, 1937. E. P. BULLARD ET AL ,2,086,852

MACHINE TooL y Filed Oct. 30, 1936 9 Sheets-Sheet 7 mum va July 13,1937. E; P. BULLARD E1' Al.

lucarne Toon und oct. so. 1936 9 Sheets-Sheet 8 July 13, 1937. E. P.BULLARD ET A1. 2,086,852

MACHINE TooL Filed oct. 30, 1936 9 Sheets-sheet 9 l mllllllllllv FEM E/vEsr H. JoH/vsmv By F50/vx H. MussLER I elements, are about to befiled.

Patented Joly 13, 1937 UNITED STATES PATENT OFFICE' MACHINE TOOL EdwardP. Bullard, Edward C. Bullard, and Edward P. Bullard, III, Fairfield,Gustaf R. Appelberg and Ernest H. Johnson, Bridgeport,

Connecticut and Frank H. Mussler, Stratford, Conn., assignors to TheBullard Company, a corporation of Appuoouon oetober so, 1936, serial No.108,494

such a machine, it being' among the general ob jects of the invention toprovide such combina.- tion and interrelation of parts whereby the Wholecombines to provide a simple, emcient, rapid, flexible and automaticmachine, which will faithfully perform a plurality of operations withdependability and accuracy.

hiany of the elements of the machine form the subJect matter ofindependent copending applications, which are directed to such elementsper Y se, regardless of the structural details of the machine with whichthey are associated, and this invention is in part concerned with thecombination and interrelation of such elements when combined in the typeof machine herein set forth.

Attention is, therefore, directed to the following copendingapplications which relate to certain elements or sub-combinations of thestructure to be claimed in the present case:

Sg?! Applicant Filed Title 727 44o E. o.nnnnrd- Moy 25,1834 Feed works729,366 E. C. Bullard---" June- 7, 1934 Bi-motor iced Works 9.11K E. P.Bullard and Mar. 2i 1935 Machine tool spindle 35,459 EElillmson" A d mwns1-,omm l al' 1 1035 Lock b' 39, ZM E EPuIllard and Selpgt.; g; 1935Carriexi'mmcchanisms hes o n 51,735 E. P. Bullard ANov. 27, 1935 Bindingdevices 65, G R Appelberg-. Feb. 24,1936 Stroke control adjustn xg formachine 65,409 iG. R. Appelb'erg-- Feb. 24,1936 Double index mecha-98,472 E. P. Bullard, III- Aug. 29, 1938 Machine controller Otherapplications, covering specific structural Generally speaking, it is adominant` object of the invention, to provide a new, emcient andimproved station type machine tool which will. meet thetever increasingdemands of industry for speed, aecuracyf' durability and economy ofmanufacture and operation.

Another important object of the invention is to provide a' multipleoperation machine which lends itself to a wide variety of effective andeiiicient employment. The term exibility has (ci. 29-381 l been appliedto this important, advantageous characteristic of the machine asindicative of its ease of change-over from one type of Work to another,and its general applicability to widely varying demands of production,both as to cycles of operation and work to be performed.

' A further aim of the inventors, carried out the machine of the presentinvention, was to provide for ease and multiplicity of adjustmentthroughout the entire device. Such various adjustments have the tripleadvantage of,vrst, contributing to the establishment, maintenance andvariability of coordination between cooperating elements and functions;second, providing for a facilityA of adjustment to compensate for wear,disalignment and abuse to which the machine may be subjected; and,third, to increase the ease,

economy, laccuracy and uniformity of manufacture not only of the machineitself but also articles produced or operated upon by the machine.

Another important object of the invention is to provide high speedoperation by avoiding the necessity of a main Aclutch and avoiding thenecessity of stopping and starting the spindle drive shafts during theindexing operation; machines of the type referred to having previouslyrequired that, during the indexing cycle, many of the instrumentalitiesof ,the machine, including the spindle drive shafts, were stopped and,at the expiration of the indexing` movement, inauguration of -the'operation of such instrumentalities is required thus losing the kineticenergy which would iiow from a continuous operation thereof.

In the present machine, full mechanical eiliciency Q is utilized toobtain economy of power as well as of speed and smoothness of operation.y

As indicated by the enumeration ofthe copending applications, it is alsoanimportantvobject of the invention to provide for a combination andcooperation of certain of the various inventions set forth therein.Therefore, it is an object to unite, in one unitary, compact structure,a plurality of cooperating instrumentalities such that the machine, asan entirety, will express the virtues of the individual components.

It is further an object to provide, in such a machine tool, thecombination vof synchronous spindle drive and spindle braking andlocking mechanism with improved indexing means and chuck operatingmeans, and further in combination with improved carrier lockingmechanisms, tool slides, feed works and timing mechanisms.

Another important object is to provide', in combination with such,features, an improved, and

readily changeable, double indexing lmechanism '55 Vao whereby themachine may be operated to move each spindle from one work station tothe next adjacent work station; or to another work station,oncefremovedfrom the adjacent station, so as to provide forsimultaneously carrying out two different series of operations asreferred to in the prio-r patent to Edward P. Bullard, '1,455,282. i lOther objects of the invention are further to provide, in such amachine, an improved and synchronous control system for controlling andcoordinating the operations of associated instrumentalities.

Another object is to provide a machine, of the character set forth,which will be simple in construction and substantially automatic inoperation, the present machine having been designed to avoid numerousparts heretofore required in the manufacture of, such as the machineillustratedun 'the patent t Edward P. Bullard, Jr., No. 1,360,175, andmachines intended for the same general purposes. Numerous other objects'and features of the invention will be apparent (from a consideration ofthe specification taken in conjunction with the accompanying drawings inwhich:

Figure y1 is a front elevation of one practical embodiment oftheinvention.

Figure 2 is a vertical section through the machine taken on the angularline 2-2 of Figure 3. Figure 3 is an enlarged horizontal, sectional viewthrough the superstructure off the machine, fragments thereof beingtaken on the levels A-B-C-D and E of Figure 2, as indicated by thesegments A-B--C-D and E of Figure 3.

Figure 4 is a horizontal, sectional view taken on line -4-4 of Figure2."-

Figure 5 is a horizontal, sectional view taken on line /I-S of Figure 2.

Figure 6 is an enlarged horizontal sectional view taken on line 6--8 ofFigure 2.

Figure 7 is an enlarged horizontal, sectional view taken on line 1--1 ofFigure 2.

Figure 8 is an enlarged detail, in end elevation, of one of the feedworks of the machine.

Figure 9 is a vertical side elevation, partly in section, and partlyVbroken away, of the feed works shown in Figure 8.

Figure 10 is an enlarged detail, in side elevation, of certain timingmechanism appearing in Figure 2.

Figure 11 is a detail' of a portion of the mechanism of Figure 10 and istaken from an angle of 90 degrees with respect to the view-of Figure-10.

Figure 12 is a detail showing a top View of the indexing clutchmechanism; and

Figure 13 is a section on the line Ilof .Figure l2. l

General characteristics lThe machine shown in the accompanying'drawings, and described in the following speci- \fication, is a verticalstation type lathe machine itool, which is characterized by having screwfeed @tool heads, synchronized drive for the work spindles, braking andpositive lock for the spindle at the loading station, improvedindexingand carrier llocking mechanism, means for conveniently changingthe indexing cycle to provide for double indexing, a novel cycle controlmechanism and improved feed works for the tools-' I The machine isfurther-characterized by the provision of two driving motors, one ,a' nmotor, which drives the spindles and the in exing mechanisms, and whichdrives the tool heads Jr., No. l,

during-their feeding operation so as to provide synchronism of such feedwith the spindle rotation, while the other motor is a high speed motoroperable to quickly retract the tools at the end of their feedingmovement and to advance the tools to the beginning of their feedingmovement.

One of the important characteristics of the invention 'is the provisionof individually controllable speeds for each spindle; and a feature ofthe invention is to provide such individual spindle drives withoutrequiring a main clutch mechanism for the machine thus permitting free,high speed rotation of the spindle drive shaft continuously during theoperation of the machine without the necessity of stopping and startingthe shaft during each indexing operation.

Another characteristic lof the machinevis the provision of readilyadjustable means in the feed works by vwhich the same maybe individuallyset to .cooperatively control associated mechanisms.

Other characteristics include the association in the machine ofindividual adjustability of various members, safety mechanisms,automatic stops and cross feeds, cushioning clutch devices, dwellmechanisms and speed change mechanisms.

Further advantages, features, objects and characteristics of the machinewill become apparent from a consideration of the following specificationof the machine here illustrated as particularly embodying the inventionshereinafter set forth in the claims.

Appearance From an observation of Figure 1 of the drawings, it willrbeseen lthat the machine is designed to present an attractive and modernappearance, free from the characteristic protrusion of numerous lbevers,operating handles and adjusting devices common to prior multiple'spindle lathes; and further free from dangerously exposed operatingelements, the compact arrangement and the vertical disposition lendingitself not only to a pleasing appearance, but also to economy of space.vl

The machine is characterized by a base section A, an intermediateWorking section B, and. a superstructure C, on the top of which aremounted the driving motors. Each of the sections constitutes acompartment, which is enclosed by sliding panels that may be moved toprovide access to any portion of the mechanism enclosed thereby. lItwill be noted that the working section B is provided with a normallyopened `section through which the operator may introduce and remove workpieces and observe the chucking operationof the machine. Thiscompartment'is also provided with a side openingv through which thechips maybe removed from the machine. This enclosing of the mechanism isdesigned not only to enhance the appearance of the machine, but to add agreater safety factor, and functions to reduce ncise and unpleasantodors. Such construction also lends itself to the application of anexhaust system for the compartment B, by which smoke and fumes from thecutting operations may be withdrawn through a suitable exhaust systemwithout contaminating the atmosphere of thesurrounding shop.

Assemblyv 2, the structure includes a base 20, which forms thecompartment A, and which houses the spindle drive mechanism, the'indexing mechanism, lock pin assemblies, chuck operating devices and thelike; the compartment being normally closed by sliding side panels 2|,which extend from the base to an upper annular member 22 supported fromthe base by standards 23, the flange of the mem-v ber 22 being cut awayand formed with a chip 4disposal chute 24 to allow for the disposal ofchips formed during the machining operations. A central cage structnrerises from the floor of the base 20 and is preferably cast integraltherewith. The cage is generally indicated by the numeral 25 andprovides bearingsY for the various instrumentalities within thev base,and provides a seat 26 for a lower extremity 21 of a central verticalcolumn 28. The column 28 provides a bearing surface for a spindlecarrier 29 in which a plurality of spindles are mounted.

Tool slides to be later described are operated upon ways formed on thecolumn by feed works mounted on the lower platform of thesuperstructure. For the purposes of safety, appearance, preventing thesplattering of the cooling liquid and for the prevention of injury, dueto flying chips, a guard ring 30 is mounted on the member 22 and,between it and the superstructure, sliding enclosure panels 3| aremounted, which normally enclose the tools and spindles.

Inthat embodiment of the machine illustrated in the drawings, eightspindles 'are provided in the carrier and the column is shown as.octagonal in cross-section, thus to provide one loading and unloadingstation and seven working stations, each working station having its-owntool head and feed works therefor. Obviously the number of spindles andstations may be varied to suit the particular requirements of themachine. The invention is not. limited to the number oi spindles nor thenumber of stations and, in some instances, the tool heads may equal innumber the work spindles.

'I'he superstructure itself is mounted upon the top of the column 28 andis enclosed by similar panels 32; on a top platform v33 of thesuperstructure is mounted a main motor 34 and ahigh speed traverse motor35. Motor control switches, v

' panels may, of course, be eliminated, the chip discharge trough may bechanged and the arrangement of the control switches may be varied.

In fact, the structural details here illustrated and described are byway of illustrating a practical embodiment of theinvention which is innowise limited to the details herein set forth.

The linain driving motor 34 is preferably mounted centrally on the topplatform 33 of the superstructure, its driving shaft 40vbeing directlyconnected with the machine through a gear 4|,

w ch meshes with gear *42, mounted on stud v434 to hich is keyed gear 44meshing with Vgear 45;

Yin latter being keyed to .stud 4s. since the s v44 and 45 are mountedon the extremities 8. 'pf their studs, the arrangement provides for theready .removal of these gears and the substitution of gears jof adifferent ratio so as to vary the speed imparted to the stud 46. Thus,from the main drive, we provide a speed selection by the provision ofthese gears, 44 and 45, which may be referred to as pick-off gears, andwhich maybe changed in order to vary the primary drive of the machinefrom the main motor. lThe stud 46 has mounted thereon a lower gear 41meshing with an idler gear 4B which, in turn, delivers rov tation to acentral main driving gear 49 upon the voperation of the machine andthroughout the entire cycle thereof, the main motor is in operation.:Such an arrangement provides an increase in emciency and speedsince itis not necessary,

during the operation of the device, to disconnect or stop such drive,thus causing loss of time and eiiiciency in reestablishing the drive andbringing it up to the desiredl speed.

Indexing drive The indexing drive also derives its energy from the mainmotor 34; the stud 43, driven thereby, having mounted thereon anintermediate gear 5I meshing with a gear` 52 mounted upon a stud'53.Upon the lower end of the stud 53 is a gear 54 meshing with a gear 55 onthe lower end of a stud 56, the upper end of which carries a gear 51meshing with a gear 58 on the upper portion of a primary indexing driveshaft 59.

Since the gears 54 and 55 are, like gears 44 and 45, mounted upon theends of their respective studs, .these gears are also adapted to beremoved and replaced by other gear sets providing a different ratioofspeeds between the studs 53 and 56. Thus these gears may also bereferred to as pick-off gears and variation in the index drive speed maybe provided for by changing such gears. This arrangement, therefore,provides an independent, variable speed drive for the primary indexingdrive shaft 59. Thus either the main drive gear 49, or the primaryindexing drive shaft, may have their speeds varied, with respect tothemain motor, or with respect to each other, by changing the ratio of bothsets of gears. It will be apparent that the speed of the machine,including the speed of the main drive gearand the primary indexing driveshaft, may be varied with respect to the speed of the main motor 34independently of each other but when adjusted they will rotate inaselected speed relation.

The primary indexing drive shaft 59 is adapted4 secondary indexing driveshafts 59 and 60. Thus there is included, lin the indexing drive, asafety element such as to preclude a damaging of parts should anyunwarranted opposition to the index- Aing movement of the carrier beapplied.

element of an indexing control clutch, the structure and operationthereof being hereinafter revferred to under the heading Index control.

Traverse drive A high speed reversible drive is provided for each of thefeed works from the traverse motor 35; a shaft 10 of which has looselymounted thereon a gear 1| adapted to be releasably driven by the shaftthrough the engagement of a springurged clutch element 12, which isrotatable with the shaft 10, thus providing a. safety device whichpermits rotation of the shaft 10, independent of the gear 1|, shouldexcessive torque be applied.

'Ihe gear 1| continuously meshes with a comlpanion gear 13 mounted on astud 14'; these gears forming a "pair of removable gears which may beinterchanged with other gears so as to provide variability in the drivefrom the traverse motor 35.` The stud 14 also carries a gear 15, meshingwith an idler gear 16, which, in turn, meshes with idler gear 16Aloosely mounted on the secondary indexing drive shaft 60. The gear 16A,in turn, meshes with a central bull-gear 11, also loosely mounted, butmeshing with a plurality of loose gears 18, one for each feed works.Thus it will be seen that the traverse motor provides a reversible highspeed drive for each feed works. The Fdrive includes change speeds bymeans of thegears 1| and 13, which constitute pick-off gears, and alsoincludes the above described safety device which will preclude strippingof gears or damage to the motor' as a result of excessive torque. I

Feed works For each tool station of the machine, there is provided anindividual feed Works for operating the tool heads in such a way thatthe spindles are individually driven in synchronism with the dr1ve ofthe tools at their respective stations during the cutting operations.tion of the detailed structure of the feed works, reference may be hadto Figures 8 and 9, and to the copending applications, Serial No.727,440, filed May 25, 1934, and Serial No. 729,366, filed June 7, 1934,hereinbefore referred to. Each feed works is adapted for selectivedrive, either from the main motor 34 or the traverse motor 35. The mainmotor drive, which is used in the cutting operation of the tool head andfor driving the spindles, is'taken from the bull-gear 19 throughindividual idler gears mounted upon spindle drive shafts 8I, while thereversible traverse drive is taken through similarly mounted idler gears18. The main motor drive, through gear 80, drives a companion gear 82mounted on stud 88 to frictionally drive the stud therewith, thefrictional relationship providing .a safety factor for the drive fromthe main motor. Upon the upper end of the stud 83, a gearl meshes with acompanion gear keyed to the individual spindle drive shafts 8|. Thegears 84 and 85 are companion 4pick-oil' gears, which may be readilyremoved and substituted by gears of a different ratio so that themachine provides for individual speeds fr'om the main motor for each\feed works and spindle drive shaft. The variation in such speed,effected by a change in the ratio of gears 84 and 85,' will be seen tosynchronously affect *the drive, at that station, of both the spindledrive shaftand the feed works. However,

such variation will not affect eitherI the com- For a considerapanionfeed works or drive shafts. i. e., those for the other stations; norwill it affect the feed works drive as delivered from the traverse motor85.

The drive for the feed works Iproper is taken from the spindle driveshaft 8| by a worm 86 mounted thereon, which engages a worm wheel 81,mounted upon a shaft 88, upon the forward end of Vwhich is mounted a.gear 89 meshing with a companion gear 90; the gears 89 and 90 beingpick-off gears which may be readily removed and substituted by gears ofdifferent ratios so as to effect a. change in the speed of the feedworks drive from themain motor. It will be noted that this means forvarying the speed is not only individual to each feed works, `but doesnot affect the speed of the spindle drive shaft 8|. Thus, by changingthe gears 89 and 90, the speed of the feed works, with respect to thespeed of the spindle, may be varied without disturbing the synchronismbetween both drives. 'I'he gear 90 is mounted upon the forward end of ashaft 92, parallel to the shaft 88, which has formed thereon a worm 93,which drives a worm gear 95, and which constitutes the feed gear for thetool feeding drive of the feed works. The gear is loosely mounted uponfeed screw |00 and feeding drive is established for the feed screw |00by clutching of the gear 95 thereto. Theupper face of the gear 95 isprovided with clutch teeth 96, engageable by a clutchelement 98, thelower teeth of which cooperate. with teeth 8S when the tool head is tobe driven from the main motor. The clutch element 98 is splined to thefeed screw |00v so as to impart rotation thereto when the clutch isengaged.

Reversible traverse drive from the motor 85 is provided for by a gear|02, which is driven from the idler gear 18, loosely mounted on thespindle drive shaft 8|; the lower face of the gear |02 having clutchteeth |04, similar to teeth 98, and engageable by the clutchA element 98to establish drive of the feed screw I 00 from the gear |02.

Feed works control structure between adjustable stop screws |09 and I|0, whichC limit the extent of the rotarymovement of the shaft |05 andthus the extent of movement of the clutch element 98. The'lug |01 isalso provided with a pin I I2, which is adapted to be engaged by aspring-urged arrowhead II4, which is adapted, by engagement with the pinI2, to urge the shaft |05 to its extreme position in one direction1 orthe other, after actuationthereof by the actuating mechanism.

The forward end of the 'shaft |05 is further provided with an actuatingarm I5 having ends I|8 and I1 which are alternately engageable by cams II8 and I I9, respectively, which camsare mounted shaft i2 l', areprovided through the sleeve m, 4the lower end of which is connected bybevel gears |24 with a manually rotatable adjusting shaft |25 to which awrench may be applied to independently 5 adjust the lmechanisms in theoriginal tooling operation. Lost motion drive for the disk |20 isprovided for by mounting the disk loosely on its shaft |2| and providingthe shaft with a fingerl 20A mounted between adjustable lugsl |20B onthe face of the disk |20. Thus, with the parts shown,

as in Figure 8, the shaft |2| may be rotated in clockwise direction, alimited amount, independent of the disk |20, or until the finger |20Astrikes the right hand lug |20B. Similarly in reverse operationfollowing a clockwise rotation such lost motion ensues.v

The oscillating movements of the shaft '|05 are controlled not onlydirectly from the movement o f the arm I5, by engagement with the camsH8 and H9, but are also controlled by reciprocation of a holder |26 forthe arrowhead I4. The holder |26 is slidable within its bracket |21, itsmovement being limited by adjustable stop screws |21A. 'Ihe slidableshank of the holder is pro- 25` vide'dwith. a pin |28iengageable by aforked extremity |29 of a bell-crank |30, which is pivoted, as at (3|,and which terminates in an opposite downwardly extending arcuate end|32, which has a downwardly extending finger |33, which may be 30 bothmanually and automatically operable to shift the arrowhead in itsbracket. The pin |28 is also engageable by cams |38 and |35 mounted onthe disk |20 in order to perform certain functions hereinafter discuedunder the heading Feed works control operation. The finger |33, and thusthe arrowhead, may be moved manually bya forked arm |36 secured to amanually'operated rod |38, which terminates in a hand lever |40; thiscontrol being individual for each of 40 the feed works, or the arm maybe' shifted by a push-rod |42 mounted upon the upperjend of a sleeve |43concentric with the rod |38, which sleeve is operable automatically intimed sequence in the `operation of the machine through links 45 |44.

Feed works control operation pin |I2 upwardlyI with it, due' to theengagement of the end' of ,the arm ||5 with the flat stepped surface ofthe cam H3. lAfter the ar- I rowhead passes the pin |2,'its lowerslanted surre-engagement of the teeth |04, the head is reface will exerta downward pressure on the pin e0 ||2, thus tending to rock the shaft|05 in counterclockwise direction, (Fig. 8) in which direction it isfree to move, whereupon the clutch actuating fork will move the clutchupwardly to engage the teeth |04 of the gear |02 and thus initiating a55 traverse movement of the head.

' During this phase of the .automatic cycle of operationkthe reversiblemotor 35, driving the gear |02, will be operated in such a direction asto. rotate the feed shaft, or screw |00, through 70 the Aclutch 98 insuch direction as to cause down direction of movement of the tool head.During the automatic cycle, the movement of the clutch 88 from neutralis effected, not by the hand lever |40, but through the push-rod |42 aswill be more 7.5 fully explained hereinafter; the same, directions outerface ofthe cam I8 which, by this time. has

of movement and the same reactions of parts will take place. With theclutch 98 engaging the teeth |04, it will be seen that the shaft |2| isrotated from the feed screw in a clockwise directiori (Fig. 8) inresponse to such down traverse 5 movement. The initial movement of theshaft |2| in the direction of the arrow (Figure 8)v will not cause anyresponsive movementof the cam I' wheel, or disk, |20 until such time asthe nger |20A abuts the right hand lug |20B. The cam 10 wheel, or disk,thus remains stationary during the first part of the down traversemovement of the head and, as will be hereinafter described, remainssimilarly stationary at the beginning of the subsequent up traverse.movement. e 15 Upon the engagement of the finger 20A with the right handlug |20B, the cam wheel, or disk, |20 is picked up and moved with theshaft |2| infclockwlse direction, such movement being very slighthowever. Upon such slight movement- 20 of the cam disk, the cam |34thereof (i. e. theshoulder indicated by the broken line in Fig 8)engages the pin |28 moving'it, and the arrowhead holder |26, downwardly.Due to the fact that the clutch is in its extreme upward posi- 25 tion,no further movement of the shaft |05 is possible, thus the arrowheadagain passes the pin, and on passing dead center urges the shaft |05 inclockwise direction which is, at this time, permissible, due to the factthat the extremity 30 ofthe arm H5 has been relieved of retention by thecam ||8 because of the counterclockwise rotation of the cam wheel. Thus,shortly after the engagement of the finger |20A with the right handplate |20B, the clutch will be shifted down- 35 ward, disconnecting therapid traverse drive to the feed screw and engaging the clutch with thelclutch teeth 96 of the gear 35 which is driven through the gears 89 and90 from the shaft 88. At this time the feed screw will be operated in 4o.the same direction as before but at a downward feeding speed insynchronism with the drive of the spindle, since both the spindle andthe'gear- 95 are synchronously driven from the shaft 8|.

During the feeding movement, the cam disk 45 moves ,continuously withthe shaft |2| by virtue of engagement of the nger |20A with the righthand lug |20B, the feedingmovement being terminated individually foreach vhead by the engagement of the cam |35 with the pin |28 which 50-raises the arrowpoint past the pin ||2, which thus rocks the shaft |05to throw the clutch element 98 out of engagement with teeth 86 and intoengagement with teeth |04 thereby changing the feed to up-traverse.During the feeding 55 movement, associated synchronized mechanism,hereinafter described, provides for the reversal of the traverse drivemotor 35 so that, upon such turned at traverse speed to the initialstarting position. Upon such reversal of the-feed screw,y the shaft |2|,which rotates therewith, is -reversed and the lost motion between it,and the cam wheel, or disk, is picked up by engagement of the linger|20A with the left hand lug |20B 65 until such" time as the left handside of the cam face of the cam |84 again engages the pin |28 to movethe arrowpoint downwardly past the pin ||4. As the arrowhead passes deadcenter the spring will urge the shaft 05 to move the 70 V clutch towardthe feeding position; such movement, however, being prevented at thistime by the engagement of the extremity Il with the been rotated toa'positlonradially in line with 7 extremity ||1. The up traverse willtherefore continue until the outer face of camfil# is car-` ried pastthe extremity ||1 at which t' e the arrowhead spring will lock the partsintoxthe position shown in Figure 8. Thus the feed works provides for anautomatic cycle of operation; a down traverse, a down feed and returntraverse and av return of the control parts to neutral, all beingautomatically controlled and individually adjustable as to extent foreach head, due to the adjustment of the cams on the disk and theadjustability of the lost motion.

Index control The synchronized control of the various feed works isprovided for in connection with the control of the indexing mechanism,the several feed works having joint control by virtue of an indexcontrol plate rotatable with each of the shafts |2| in the manner setforth in the 'copending application of Gustaf A. Appelberg, Serial No.65,408, filed February 24, v1936. The plates |50 are mounted uponsleeves |5| which may be angularly adjusted, with-respect to the shafts|2|, by loosening nut |52 and turning the sleeve |5|, with respect tothe shaft |21, so that individual adjustment and positioning of theseplates may be provided for. The shaft and sleeve are locked together inadjusted relation by the serrations or te'eth, shown in Figure 9, oncollars attached to the shaft and sleeve. Each plate is provided `with arecess indicated at |53 in Figures 2 and 9, which is adapted to receivetherein the head of a control rod |54, slidable in the frame of the feedworks, the recess being adapted for registration with the head only atsuch times as'when the tool head is in a fully raised position and theclutch in neutral position as hereinbefore described. Such anarrangement provides for the inward projection of each rod by thecamming action of recess |53 as soon as movement of the feed screw takesplace. The inner ends of the rods, as indicated at |55 in Figures 3, 9and 13 are, when in the inward thrust position, adapted to interengagewith lugs |56 on an upper element |51 of the index clutch which elementis thus restrained from movement during any movements of the screw feedshafts. When, however, each of the heads have returned, after feedingoperation, to their upward position, the rods |54 are moved by springpressure outwardly and are received within the recesses |53, thusreleasing the element |51, which is under normal pressure of a spring|58, and which is thus moved by the spring to cause a clutching actionbetween the element |51 and its companion driving member |60. Thestructure is similar to the indexing clutch arrangement ,in Patent No.1,360,175, a detailed section showing the clutch arrangement beingindicated at Figure 13. The element |60 is continuously driven by themotor 34 through the shaft 60 and gear |6| and such clutching providesfor a drive of an indexing sleeve |62 to which element |51 is keyed; theelement |60 being looselymounted thereon for continuous rotation by theshaft 60.

Indem arm On the lower end of the central index sleeve |62 is mounted agear |63 which meshes with an idler gear |64 which, in turn, drives anindexing arm |65 through its gear |66. The indexing arm |66 terminatesat its upper end in a crank |61 which is adapted to engage adjustableindexing plates |68 and pass between on the-carrier-ZS,

retain the same in its engaged position; the rethus to move the carriera predetermined distance upon each revolution of the indexing arm.

The cooperation of the indexing arm with the adjustable plates |68 ofthe carrier is more fully explained in specific detail in the copendingap- 5 plication of E. P. Bullard and E. H. Johnson, Serial No. 39,234,filed September 5, 1935 for Carrier mechanism, to which reference may behad. The plates |68 are mounted on the lower face of the carrier and areapertured to permit the spin- 1 dles to freely pass therethrough and maythus be freely adjusted with respect to they carrier without disturbingthe spindle setting. These plates |68, which may also be noted in Figure6, receive turning eiort from the terminal end of the inl5 dexing crank|61 and, by their adjustment, the movement of the carrier, inresponse'to each rotation or" the arm, may be so as to provideforadjustment and compensation for wear, and to provide ease and accuracyof the original as- 2 sembly, it being unnecessary to machine thecarrier with such accuracy as to ensure accurate indexing thereof sinceaccurate indexing is provided for by the positioning and location of theplates |68.

Loek pins In order to assist in the accurate positioning of the carrieron the termination of the indexing operation, and further in order tosecurely 3 lock the carrier in its indexed position, a reciprocatinglock pin |10 (Figs. 2 and 6) is provided within the base which isadapted to successively engage lock pin lugs |1| adjustably secured tothe carrier. The lock pins, and their associated 3 lugs, are illustratedin detail in the copending application of E. P. Bullard, Serial No'.36,459, led August 16, 1935 for Lock pin assemblies. The lock pin |10has a furcated end and is set to pe'rmit a limited resiliency of thefurcations'thereof 40 and, upon engagement with a lug, they receive abit thereof between the furcations. 'I'he cooperating angles of thefurcations and bit act to assist in positioning the carrier and tothereafter siliency of the furcations acting to provide 4 smoothoperation and avoid jarring due to the locking action.

The lock pin |10 is normally urged upwardly by a spring |12 so as tomaintain its engagement with the lug |1| during the machiningoperations. The lower end of the lock pin |10 is engaged by an arm |13(see Figure 6) of a centrally pivoted lock pin operating bar, anopposite Aarm |14 ofwhich, through a roller |15, rides 5 upon a lock pinoperating cam |16 mounted upon the gear |66; the 'contour of the cambeing such that, just prior to the engagement of the indexing orang |61with one ofthe carrier plates |66,

the arm |14 of the bar will be raised, thus lower- 60 ing its oppositearm |13 and retracting the lock pin |18 against the pressure of itsspring |12; the contour of the cam further providing for the lowering ofthe arm |14 just as the indexing movement is\being completed so that thepin |10 65 will, through its spring pressure, be urged upwardly toengage the next successive lock pin lug |1I.

An important feature of this phase of the invention is more fully setforth in the copending 70 they may be individually shifted, so astocompensate for wear and to eliminate the necessity of perfect accuracyin the machining of the carrier. In order to compensate for varia 'onsdue to wear, the lugs may be adjusted sideway such adjustment may be inconformity with the orementioned adjustment of the indexing plates 68.However, each individual plate and each individual lug may be separatelyadjusted, and thus the invention provides for an adjustment between'indexng movement and locking position to the end that, in originallyassembling the machine, and in subsequent adjustment of themachine, awide exibility of adjustment, lwithout the necessity of rebuilding andreboring, may be secured.

It will be seen that,by this arrangement, a synchronized action of thelocking mechanism with the indexing mechanism is provided for, and suchsynchronism is adjustable in that both the movement given to the carrierand the position at which the carrier is locked may be individuallyadjusted, with respect to stations, and individually adjusted, withrespect to each other.

Carrier binder Associated with the indexing drive sleeve |62 is a bindermechanism operable in timed cycle with the indexing to assist in lockingthe carrier, with respect to the column, so as to ensure a positive,vibrationless position of the carrier. This mechanism includes a cam |80(see Figure- 5) secured on the sleeve |62 for rotation therewith; itscam peak being arranged-at the end of ythe index cycle to move outwardlya pivoted actuating arm |8I, which Iis lsecured to an actuating stud|82, the lower end of which is formed in a crank, or eccentric,journalled within a yoke- |83; the ends` of which bear against bindingpins |84, whichy extend through `the walls of the column 28; thearrangement being such that, at the end of the index movement, the armis rocked and the yoke moved outwardly to exert outward pressure uponthe binding pins |84- which are in engagement with the inner face of thecarrier.

Spindle drives The spindles i90 are adjustably mounted through aperturesin the carrier 29 (see Patent No. 1,970,276 and application of E. l?.Bullard et al., Serial No. 39,234, filed September 5, 1935) and aresuccessively driven at the successive work stations by spindle drivingshafts. 8| which, as

aforesaid, are driven from the feed works and in synchronism with thefeeding drive.- Splined l forrotationwith andfor longitudinal movementon each shaft 8| is a gear |9| which may be rei plate is adapted forreciprocating motion by enciprocated to a position out of engagementwith the driven gear by forks |92v fixed to reciprocating rods |93 whichrest upon a plate |94, which sagement of a pin, or roller, |95 thereofwith a cam |96 mounted upon the indexing sleeve |62. This arrangement issuch that, prior to the'moveent gears |91, successively, as the carrieris in- -tional drive, or braking, of the gears |91, which .for securingthe same in a stationary-position.,

ment of the carrier to its new position, the plate is raised by the camto move upwardly the gears |9| so that there will be no obstruction tothe movement of the carrier to its new position and so as to avoid anyclashing of the gears |9| with 5 the gears l|91 which are mounted on thecarrier for indexing movement therewith and mesh with the spindle gears|98.

'I'he lower ends of the shafts 8| also carry, fixed thereto, gears 200which are in constant mesh with companion gears 20| mounted on splinedsleeves 202 through which are reciprocated cone clutch devices 203.lIlhese devices are also actuated in timed sequence with the indexingmove` ment by engagement, at their lower ends, in a plate 204 which isperiodically reciprocated by the engagement of a roller 205 thereof in acam 206, which is mounted on the gear |63 which rotates with theindexing sleeve. The sleeves z 202, cone devices 203, plate 204 etc.,are carried. by the cage 25 and do not rotate with the carrier 29.Accordingly, it will be understood that the clutch devices 203 cooperatewith the differdexed. 25

The cam path of the cam 206 is such that the plate 204, and with it thedevices 203, are raised l prior to the lowering of the gears |9l. Asthese devicesl are raised, cones 203 of the clutch devices engage Withincompanion clutch surfaces on the gears |91, this engagement beingestablished after the carrier is moved and locked into its new position.Such engagement provides for a fric` synchronizes the speeds 4of thegears |91 with those of gears |0|. A further movement of. the indexingsleeve drops the gears |9| into mesh with the gears |91 and drops thecone clutch devices 203 so that positive drive of the gears |91 from theshafts 8| is established but only after 40 primary fricticnal driveswhich provide for bringingthe gears |91 to the Vsame speed as that ofgears |9| before they are meshed.

Spindle braking and lockingl 45 As also illustrated in the copendingapplica-1, tion above-mentioned, means are provided at the loadingstation, at which there is no drive shaft 8| forretarding and brakingthe spindles and 'I'his means includes a gear 2|0, (Figure 2) which .isa counterpart of gear ISI, and which may be raised, or lowered, by afork 2| xed upon a stud 2|3, these parts lbeing counter-parts oftheparts |9|,-|92 and |93. A friction brake assembly 2|4, similar to clutchdevice 203, slidable through the frame structure in response tomovements of the plate 204, is provided, but, in this instance, it iskeyed against rotation inthe frame structure. Thus, when the gears |91reach the loading station, the brake 2H first acts to retard the spindleand subsequently the gear 2|0 drops to secure the 'gear |91 and, withit, the spindle against rotation.

Chuck operatorl Each spindle is provided with a suitable chuck, orfixture. VFor operating the jaws thereof when they are at the loadingstation, which, by the way,

may be occupied by two spindles in the case of '70 double indexing, achuck operating drive is provided from the main central shaft 50 by agear sov ' an upper gear 223 and a lower gear 224, both of which areprovided with clutch teeth which may be alternately engaged by a slidingclutch 225 keyed to a chuck operating shaft 226. The movement of theclutch is under the control of foot elements 221 which, by movement inone direction or the other, establish drive for the shaft 226selectively from oneof the gears 222 or 224. As shown in Figure 2, suchdrive will be delivered by a gear 228 to a gear 229 secured to arotatable chuck operating rod 230 ymounted within each spindle, rotationof the rod being adapted to rock chuck operating gear segments 22| andthus to move the chuck jaws in a conventional manner. For precludingpremature engagement between the gears 228 and 229, the gear 228 isslidably mounted on shaft 226 and moves upward into engagement with thegear 229 in sequence with the indexing movement, such upward movementbeing provided by a fork 232 mounted upon a rod 233' operated by an arm224 which is centrally mounted on a part o'f the frame, as at 235; itsopposite end being engaged by a cam 236 associated with the indexing armE25. This cam 236 is so formed that the gear 22B will be held out ofengagement with the gear 229 whenever the carrier 29 is undergoing anindexing movement. In the case of two chuck operators. as shown inFigure 6, the second gear 228 is actuated by a cross-link 221.

Tool heads disclosed herein, it is thought sufiicient to refer to thecopending applications of F. H. ,Musslen Serial No. 51,726, led November27, 1935 and E. P. Bullard, III, Serial No. 59,731, iiled January 18,1936, which disclose toolr heads particularly adaptable to the presenttype machine. Buch heads are as shown in Figure 2 and include aninternally threaded member 29|, the threads of which embrace the threadsof the feed screws |00. The members 29| being secured against rotation,it is obvious that such members will move vertically with respect to thecolumn 28 upon rotation of the screws |00. operatively connected to themember 29| is a tool slide, lor saddle, 293 which may move in ways 292formed on the column 28.

' Compound'movements of a tool 294 may be provided for bysuch'mechanisms sis-shown in the applications referred to. Obviously theinvention is not limited to the speciiic type of tool head I Cuttingcompound system v The present invention includes a built in'systemforthe direction and eicient delivery of cutting compound in the form ofa coolant, or a lubricant. This system includes l an annular chamber 2li(see Figure 2) formed on the peheads move'the coolant. or lubricant..discharge end moves therewith to eifectively deliver the huid in themost efficient manner.

Manual adjustments For manually moving the clutches of the feed works,in addition to manual setting of the screw through gear |24 and inaddition to manual initiation of the feed works cycle, individual arms298 (Figs. 2 and 9) are provided which oscillate vertical rods 298, theupper ends of which engage, in a cam slot thereof, fingers 300 (seeFigure 3) connected with the clutch operating fork |06 so that uponoscillation the arms 29B may move the clutches independent of theirautomatic operating elements.

Hand means may be provided forprecluding inadvertent indexing of themachine during adjustment or tooling operations, which means include astop 28|- (Figs. 2 and 3) on the end of the index clutch element 51,which stop may be abutted by a link 282 controlled by an arm 283 on ashaft 284, the lower end of which terminates in a manually controlledhandle 285. As shown in Figure 3, the shaft- 284 may be secured in itsadjusted position by a spring urged plunger 286. During the normaloperation of the machine, the handle is moved to retract the plungeroutv of the engagement with the stop so that normal indexing operationsmay be performed.

Automatiecucle control As hereinbefore stated, the individual lfeedworks may be individually caused to go through their .cycle ofoperations by manipulation of the individual hand levers |40. Forautomatically initiating the simultaneous operations of all the feedworks, as in the usual continuous operation ofthe machine, the push rods|42 on the sleeves |63 are simultaneously actuated by links |44 whichare joined through the sleeves |43 to form a complete circle actuated byan arm 240 (see Figures 3, 10 and 11). 'I'he arm 240 forms part of asynchronized cycle control mechanism and is mounted upon a verticalshaft 24| which is adapted to be oscillated by a push rod 242, slidablymounted in the flxed frame, the outward thrust of which will push an arm243 xed on the lower end of the shaft 24|, thus to oscillate the sameand move the arm 240 to thus move the links |44 against the tension ofspring 244 and thereby simultaneously actuate all the feed works bellcranks |30 and thereby simultaneously initiate the working cycle ofallthe feed works.

Multiple indexing driven through its gear 241 from a gear 244 mesh-- ingtherewith and mounted upon a shaft 240, the lower end of which is drivenby the sleeve |42 through gears zu and zu with the remit that' theclutch member is driven. stone-hal! the speed of the sieeveln. I'heAclutch member is adaptedtobemsnuallyshifted byac a shaft- 252 by theapplication of a wrench or key'to the end'of this shaft. The detailsofthis `construction andoperation of this end otwill be found inthe appli- 211, which thus normally engages the clutchl teeth to causerotation thereof with rotationof cation of G. R. Appnberg, serial No.65,409, med- February 24, 1936.

By this provision o f selectable driving means for the cam 245, multipleindexing is provided for. With the clutch in its lower position, thegearing is arranged so that the drive to the cam 245 is at one-half thespeed of the sleeve |62 so that a termination of the indexing movementand a reestablishmentof the feed works operation is provided for onlyafter two complete revolutions of the sleeve |62 and consequentlytwoindexing movements of the carrier. This arrangement also provides for anadjustment ,in the angular position ofthe cam 245, with respect to thesleeve |62, so that, during the double indexing operation, the highspotin the cam, which actuates the feed works, can be altered tocompensate for a' variation in the setting of thexparts, it takingsomewhat more time to lock the carrier and carry out other associatedindexing operations, after the double index, than is required for asingle index. Thus, just'prior to the end of the indexing movement,whether it be single or double, the rod 242 is moved outwardly and thelinkage system is moved against the pressure of the spring 244 toinaugurate the down traverse of all the tool` heads through releasingall of the feed works clutches by the movement of the push rods |42.

For controlling the circuit to the reversible motor 35 so that, at theend of the down traverse movement of all the heads, it will be reversedand ready to traverse the heads upwardly `at the end ofthe feedingmovement and to permit time lapse between energization of the motor soas to avoid shocks, power vlosses and motor heating effects, due toinstantaneous reversals, a switch, indicated at 260 (Fig. 2), isprovided, which switch is under the double control of the rod 242,actedupon by the cam 245 and by a push rod 26|` acted upon by a cam 262. Apin 263 on the rod 242 bears against one arm of a switch operating crank264, while another arm of the latter is received within therod 26|. Thisarrangement is such that, as the indexing sleeve |62 rotates, the rod isgradually moved outwardly to move the switchto a neutral position to cutpower to the motor 35; such movement, however,

clutches to' an engagement with the traverse drive as aforesaid.

Such movement of the switch is effected by a. counterclockwlse rotation(Fig. 2) of the crank 264 which, through engagement with the rod 26 I,retracts the rod downwardly against spring tension and the rod is soheld in such downward.

position for a predetermined time byl means of a timing controllingmechanism driven from the secondary index drive shaft 60, which shafthas formed thereon a worm 210 driving a worm wheel 21| and a connectedgear 212 (Figs. 10 and l1) which in turn mesh with a gear 213, which hasformed thereon clutch teeth 214 adapted for' periodic engagement withclutch teeth 215 of the rod controlling cam 262. The cam 262 is normallyurgedtowards thegear 213 by a spring the gear 212 from the shaft 66.Such engagement is, however, precluded during the indexing cycle bythe'interrelation ofthe rodsy 26| and 242. When the rod 242 isin inwardposition, during the indexing cycle, the crank 264 is in 'a clockwiserotated position and-holds up the rod 26|, a projection 218 of whichbears against a tapered surface 219 on the cam, thus holding the camagainst the tension of the spring 211 and out of engagement with theclutch teeth 214.

-Near the end of the indexing movement, as

` aforesaid', the rod moves outwardly, gradually forcing the switch intoneutral position and gradually retracting the rod 26| downwardly untilsuch time as the upper end of the projection 218 moves out from itsengagement with the gears tapered surface 219, permitting engagement .ofthe clutch teeth, whereupon the cam 262 will ,rotate with the gear 213moving the high spot of the motor only for a predetermined timesufficient to permit all the heads to complete their down ,traversemovement, such timing is provided for by the contour of the raisedvportion of the cam 262, which, beingv rotated from the main motor, holdsthe rod down for a predetery mined length of time. Upon passing the highspot, the rod moves upwardly under tension of 'a spring 265, thusrocking the crank 264 lin clockwise direction and, at the same time,con--V ,t

trolling the projection 218 of the rod 26| to force outwardly the camfrom engagement with .the

clutch teeth so that it remains stationary until the next indexingcycle.

" Operation I In the normal operation of the machine, after a period ofwork, the machine is shut down by the manipulation of the handle 285which causes the link 282 to abut the stop 28| and preclude furtherindexing of the machine.

the machine will continue throughout the working cycle and willautomatically stop with all of Athe heads in the up-raised position andthe index clutch element |51 released with respect to the control rods|54. At such point in the operation, both motors 34 and 35 will be inoperation and, in closing down the machine, the stop button in one ofthe switch boxes 36 may be pressed to stop both the motors, it beingunderstood that the circuit is preferably such that the holding circuitfor the motor 35 is dependent upon the operation ofthe motor 34.

In restarting the machine, after it has been The handle may be thrownout any time during the working -cyc1e and, thus, the arrangement issuch that shut downin the manner set forth, the operatore rst pushes thestart button in one of the switch boxes which will energize the motor 34, but which will not energize the motor 35, the'control circuit beingsuch that manipulation of the switch 260 is required to inaugurate theoperation of the motor 35 after which inauguration -it follows its cycleo'f operation by the .control of the switch 260. Inasmuch as thespecific'electrical circuits from the several switch boxes to the motors34 and 35 form no part of the invention claimed herein,

ythe element |60, thus starting the revolution of 10,/ the indexingsleeve |62. The indexing cycle thus started refers to the time requiredfor the indexing ysleeve |62 to make one complete revolution in the caseof single index, or two complete revolutions in the case of doubleindex, it being understood that the indexing sleeve has a free periodofvmotion both before and after theactual indexing movement of thecarrier; ,this being obtained by the fact-that the crank |61 is normallyat rest in a position disengaged from the carrier as illustrated inFigure 2 and is 'eective to shift the carrier during only a portion ofits rotation.

2. As the indexing sleeve |62 revolves, the binder cam releases thepressure applied by the yoke |83 upon the binder pins |84 and,simultaneously therewith, the cam |16 permits the lock pin |10 towithdraw from the engaged lug |1|.

3. Upon further revolution of the indexing sleeve |62, the crank |61engages the carrier and starts the actual indexingy movement thereof.

4. With such movement of the indexing sleeve |62, the cam 245 rotates to'move the switch 260 to break the circuit to the motor 35 and, in thisconnection, it will be noted, as aforesaid, that on the rst cycle ofoperation, after a period of rest, there is no energization of the motor35 until later on in the cycle of operation. However, in normal,continuous operation, the traverse motor 35 is permitted to run inup-traverse direction until the cam 245 moves the switch 260 todisconnect theymotor, which movement, as aforesaid, is in conjunctionwith the beginning of the carrier rotation.

5. During the initial operation of the indexing sleeve and prior to thetime the carrier is being indexed, the plate |94 raises the spindledrive gears |9| and the spindle locking gear 2|0 out of the plane of theintermediate gear |91 to permit the carrier to freely index to the nextstation without danger of gear clashing.

6. The indexing movement of the carrier is then brought about andcompleted and, with the carrier in its newly indexed position', the lockpin |10 is engaged with the alined bit 11| on the carrier by the spring|12 as permitted by the movement of the cam |16.

'7..Simu1taneously with function No. 6, binder pressure'is applied bythe binder cam |80.

Further rotation of the indexing sleeve A|62 ca es upward movement ofthe plate 204, thus to ove the cone clutch devices 203 into engagementth the gears |014 to inaugurate frictional drive forV the spindles.

9. Continued movement of the indexing sleeve |62 brings about theretraction of the cones from gears |91. V

10. As the spindles are brought up to speed by the friction drivefurther indexing movement of.

the indexing sleeve |62" lowers the plate |94 and.

permits the gears |9 to drop into the position shown in .Figure 2 forpositively driving the spindles therefrom.

chuck ioperating gear 223 whereupon the foot element 221 may be operatedto throw the clutch 225 to control the opening or closing of the the cam262 is'such as to hold the switch 260 in position for down -traverseenergization of the motor 35 for a predetermined length of time inl,dependent of the various feed works and the various lengths of traversemovement applied therefrom to the heads but sufficient to provide forthe maximum 'traverse movement desired.

14 With the outward movement of the rod 242 by cam 245, the links |44are moved, thus to throw the feed works clutches 98 upwards to engagelthe traverse gear and thus to inaugurate down traverse of the heads.

15. With the rotation of the feed screws |00, through the engagement ofthe clutch 98 with the traverse gear, as aforesaid, the recesses |53 arerotated, thus moving the control rods into the path of projections |56on the element |51 of the index `clutch and thus restraining thiselement against further rotation and disconnecting its clutch engagementwith the lower index clutch element |60 and thereby ending the indexcycle.

16. As the various heads come to the end of their down traverse, theyare, independently of each other, tripped into feed by the engagement ofthe nger |20A with the lug |20B and the subsequent action of the cam|34, which, as

aforesaid, acts to shift the clutch 88 'into engagement with the feedgear 85, it being understood that the length of traverse and the lengthand speed of the feed are independently determined through tlieindependentfeed works mechanism provided for each tool head.

17. After the expiration of a predetermined period of time, which isample to provide for the full traverse period for the longestdown-traverse movement of any head, the continued rotation of the switch260 to energize the motor 35 in uptraverse direction in which positionthe switch 260 is left until the beginning of the next indexing cycleexcept in the event of the main motor being shut oif which, asaforesaid, automatically shuts oi the motor 35.

20. As each head finishes its feeding stroke, the cam mechanism of itsfeed works operates lthroughthe cams-on the cam disk |20 to throw theclutch again into' engagement with the traverse gear |02 which, throughthe reversal of the motor 35 by a control of the switch 260 from thelcam 262, is now rotating in 'a direction to move the head upwardly attraverse speed.

21. As each head comes to its upper starting position, the lcams on thetiming disc act to dis'- engage the traverse clutch, and simultaneouslythe recesses |53 of the index control plates |50 permit the controlrodsl |54 to bewithdrawn so` that, as the last headarrives in its fullyupward position, theindex clutch element will be fully released topermit a new indexing cycle starting from the function No. 1 hereinenumerated; If', during the cycle, the handle 285 has been manipulatedtolock the indexing clutchv element |51, then both motors will continuerunning without any furtherfunctioning of the machine' which otherwiseautomaticallyfcontinues througha repetition of the cycles enumeratedFrom the above description of the operating functions, taken inconjunction with'the detailed description of the mechanisms of themachine, it will be clear that the machine provides a readilyadjustable, automatic high Vspeed machine well adapted to carry out theobjects of the invention.

Throughout this description, it is to be understood that the functions,in many instances, overlap each other in time 'of operation, and whereinthe word simultaneously" has been used, it is obvious that timingadjustments of the machine, in many instances, may provide fora functionbeing slightly in advance-of, or slightly behind another function whichis herein described as taking place simultaneously. j It is,

operation, numerous changes and modiflcations, and the full useofequivalents,'may be resorted: to `without 'departing from thespirit orscopeA of the invention as outlined in the appended claims.

-We claim: i v

A1. Ina machine tool, an indexable carrier, a plurality of work carryingspindles rotatably mounted therein, a plurality of continuously `drivenshafts arranged to successively drive said spindles, and a single geartrain for each shaft each embodying a pair of removable gears forcontinuously rotating said shafts at independent speeds. j t

2. In a machine tool, the combination with an indeXable carrier and aplurality of. rotatable work holding spindles mounted therein of aplurality of continuously rotated spindle driving shafts each driventhrough an independent gear train including a pair of removable gearschangeable to vary the speed of drive to the shaft, a

' gear on each shaft and spindle driving gears indexable with thecarrier to establish driving connection between said shaft gears Aandsaid'.

spindle gears.

3. In a machine tool, thel combination with an indexable carrier-havinga plurality of rotatable work holding spindles' mounted therein of a.plu'- rality of continuously driven spindle driving shafts,a single`gear train including a pairof removable gears associatedwith eachshaftfor driving said shafts from a-single source of power at independentspeeds and means for driving each spindle successively from two or moreof said shafts. l' Il 4. In a machine tool, the combination with a`central driving shaft of a plurality of continu- A l `yously drivenspindle `driving shafts each driven therefrom at independent speedsthrough a single gear train including a pair `of removable gearsassociated with each shaft, an indexable carrier, work holding spindlesmounted therein, a lsingle gear on each shaft for establishing "drivingconnection between said shaft and said spindles, whereby each spindlemay be successively driven fromtwo or'more vof said shafts. y Y,

5. In a machine tool, an indexable carrier, a plurality of spindlesmounted therein,'a single source of power `for'driving all ofsaid'spindles, a plurality of spindle driving shafts, an independentgear train connection for each shaftv each receiving the same speed ofdrive from saidsource of `power and ea'ch capable of delivering anindependent speed drive to `continuously drive its shaft at av speedwhich may be other thanA the speed of another shaft, agear on eachshaft, a spindle driving gear for each spindle 'indexable therewith andmeans for vestablishing enmeshment of the gears of said shaftlwith thespindle 'driving gears so as to drive each spindle suc,-

cessively from two or more of said shafts.

6. In a machine tool, a plurality of tool heads, t

from another', means for moving the tool yheads therefrom, an 'indexablecarrier, a plurality 'of spindlesl carried thereby and meansforfdr'iving each spindle successively fromtwo or'morel of* said shafts.

v'1. In a machine tool, aplurality of tool heads,

a plurality of shafts adapted to be continuously driven at speeds whichmay beindependent, one from another, means for moving the tool headstherefrom, an indexable carrier, a' plurality of spindles'carriedthereby and means for driving each spindle successively from each shaft.

' 8. In a machine tool, a plurality of tool heads, a plurality o fshafts adapted to be continuously driven at speeds which may beindependent, one from another, means for moving the tool headstherefrom, an indexable carrier, a plurality of 'spindles carriedthereby, means for ldriving each spindlesuccessively from two or more ofsaid shafts and a single source of power for continuf ously driving allof said shafts.

9. In a machine tool, a plurality of tool heads,l

` spindle successively from two or more of said shafts, a single sourceof power for continuously driving all of said shafts, and means formoving tool heads independently of said single source` of power.

10. In a machine tool, a plurality of tool heads,

a plurality of shafts adapted to be continuously driven at speeds whichmay be independent, one

fromr another, means for moving the tool'heads therefrom, an indexablecarrier, a plurality of spindles carried therebyfmeans for driving eachvspindle successively from two or more of said shafts and means forindividually varyingithe speed of said continuously driven shafts.

' 11. Ina machine tool, ra plurality of ltooly heads, a pluralityof'shafts adapted to be continuously 'driven at speeds Awhich may beindependent, one .from another, means for moving the tool headstherefrom, an indexable-Acarrier, a plurality of spindles carriedthereby; means for driving each spindle successively from two vor moreof `said shafts and a single source of. power for continuously drivingvall of said shafts and means for individually varying the speedof saidcontinuously driven shafts. l

v 12. In a machine tool, a plurality of tool heads, a plurality ofshafts adaptedto -bepontinuously driven at speeds which may beindependent, one

